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A099731 as a simple table

n a(n)
1 1
2 1
3 -1
4 1
5 -5
6 10
7 1
8 -12
9 59
10 -90
11 1
12 -22
13 203
14 -830
15 1320
16 1
17 -35
18 525
19 -3985
20 15374
21 -23640
22 1
23 -51
24 1135
25 -13665
26 93544
27 -342324
28 523440
29 1
30 -70
31 2170
32 -37870
33 399889
34 -2542540
35 8997540
36 -13633200
37 1
38 -92
39 3794
40 -90440
41 1356929
42 -13076588
43 78896236
44 -271996080
45 409852800
46 1
47 -117
48 6198
49 -193410

[1,1,-1,1,-5,10,1,-12,59,-90,1,-22,203,-830,1320,
 1,-35,525,-3985,15374,-23640,1,-51,1135,-13665,
 93544,-342324,523440,1,-70,2170,-37870,399889,
 -2542540,8997540,-13633200,1,-92,3794,-90440,
 1356929,-13076588,78896236,-271996080,409852800,1,
 -117,6198,-193410]

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Last modified February 18 23:26 EST 2018. Contains 299330 sequences. (Running on oeis4.)